Python-在命令行中使用参数运行函数

Question

Is it possible to run a python script with parameters in command line like this:

./hello(var=True)

or is it mandatory to do like this:

python -c "from hello import *;hello(var=True)"

The first way is shorter and simpler.

Answer 1

Most shells use parentheses for grouping or sub-shells. So you can't call any commands like command(arg) from a normal shell ...but you can write a python script (./hello.py) that takes an argument.

import optparse
parser = optparse.OptionParser()
parser.add_option('-f', dest="f", action="store_true", default=False)
options, remainder = parser.parse_args()
print ("Flag={}".format(options.f)) 

And the call it with python hello.py -f

Answer 2

./hello(var=True) would be impossible from REPL shell. In some case it could be useful to have python function available in your current shell session. Here a workaround to make your python functions available in your shell environment.

# python-tools.sh

#!/usr/bin/env bash
set -a # make all available export all variable)

function hello(){
    cd "/app/python/commands"
    python "test.py" $@
}

Content of the python script

#! /usr/bin/env python
# /app/python/commands/test.py script

import sys


def test(*args):
    print(args)


if __name__ == '__main__':

    if sys.argv[1] in globals().keys():
        print(sys.argv[1])
        globals()[sys.argv[1]](sys.argv[2:])
    else:
        print("%s Not known function" % sys.argv[1])

Then source python-tools.sh

source python-tools.sh

After the hello function is available

$ hello test arg2 arg2
test
(['arg2', 'arg2'],)